Abstract
Parkinson’s disease (PD) is a common neurodegenerative disorder of the nervous system that affects about 1 in 800 people and for which we have symptomatic but not curative therapies. At the core of the disease is the loss of a specific population of dopaminergic neurons within the brain, and replacement of dopamine through drug therapies has provided clinically significant benefit for many patients. However this therapy only ever offers a temporary amelioration of symptoms and with time this symptomatic therapy becomes less efficacious and produces its own unique side-effects. As a result more effective curative therapies have been sought, including the use of cell based therapies to replace the lost dopaminergic neurons. In this review I am going to discuss PD and its possible repair using neural transplants. In particular I am going to discuss which type of cells are best considered as a reparative therapy, where they should be transplanted in the brain, when in the disease course and in which type of patient. By considering these issues, I hope to be able to make some recommendations as to the future use of this approach in PD.
Zusammenfassung
Morbus Parkinson (MP) ist eine verbreitete neurodegenerative Erkrankung des Nervensystems, die etwa einen unter 800 Menschen befällt und für die nur symptomatische, aber keine heilenden Therapien bekannt sind. Den Kern der Krankheit bildet der Verlust einer spezifischen Population dopaminerger Neuronen innerhalb des Gehirns. Dopaminersatz durch Medikationen hat daher bei vielen Patienten klinisch signifikanten Nutzen gezeigt. Solche Therapie bietet jedoch nur vorübergehende Linderung von Symptomen, und mit der Zeit verliert diese symptomatische Therapie immer mehr an Wirksamkeit und ruft ihre eigenen spezifischen Nebenwirkungen hervor. Folglich sucht man nach effektiveren kurativen Therapien, darunter auch Zelltherapien, zur Ersetzung der verlorenen dopaminergen Neuronen. In diesem Übersichtsartikel werden MP und seine mögliche Behebung mittels neuraler Transplantate diskutiert. Insbesondere wird darauf eingegangen, welche Zelltypen am besten als reparative Therapiezellen in Betracht gezogen werden sollten, wo im Gehirn sie zu transplantieren wären, in welcher Phase der Krankheit und bei welchem Patiententyp. Ziel dieser Betrachtungen ist die mögliche Formulierung von Empfehlungen hinsichtlich der zukünftigen Nutzung dieses Therapieansatzes für MP.
Résumé
La maladie de Parkinson (MP) est une affection neurodégénérative très répandue du système nerveux, qui touche environ une personne sur 800 et pour laquelle existent des traitements symptomatiques, mais pas de traitements curatifs. Au cœur de la maladie, il y a la disparition d’une population spécifique de neurones dopaminergiques dans le cerveau. Le remplacement médicamenteux de la dopamine s’est par conséquent avéré très bénéfique du point de vue clinique pour de nombreux patients. De telles thérapies n’apportent toutefois qu’un apaisement passager des symptômes, et la thérapie symptomatique perd de plus en plus de son efficacité avec le temps, et finit par ne plus provoquer que ses propres effets secondaires. On recherche par conséquent des thérapies curatives plus efficaces, dont des thérapies cellulaires visant à remplacer les neurones dopaminergiques détruits. Cet article récapitulatif se penche sur la MP et les réparations éventuellement possibles au moyen de transplants neuraux. Il s’interroge en particulier sur les types de cellules pouvant être envisagés pour une thérapie cellulaire réparatrice, sur le lieu de transplantation dans le cerveau, sur la phase de la maladie indiquée pour cette intervention et sur le type de patients approprié. Le but de ces observations est de formuler certaines recommandations sur l’utilisation future de cette approche de la MP.
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Acknowledgements
I would like to thank those within my research group who have provided insights and experimental/clinical work to support the views put forward in this review. In addition I would like to thank my collaborators especially Dr Adrian Owen and Professors Robbins, Sahakian and Weinberger. Finally I would like to the sponsors of our work namely the Medical Research Council, The Parkinson’s Disease Society of the UK and the Wellcome Trust. Finally I would like to thank all the patients and their families who have contributed to all of our clinical research.
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Barker, R.A. Neural transplants for parkinson’s disease: what are the issues?. Poiesis Prax 4, 129–143 (2006). https://doi.org/10.1007/s10202-006-0021-8
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DOI: https://doi.org/10.1007/s10202-006-0021-8